Particle size and magnetic field-induced optical properties of magnetic fluid nanoparticles | Zendy

G. Narsinga Rao | Zendy; Y. D. Yao | Zendy; Y.-L. Chen | Zendy; Kun Wu | Zendy; J.W. Chen | Zendy

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Particle size and magnetic field-induced optical properties of magnetic fluid nanoparticles

Author(s) -

G. Narsinga Rao,

Y. D. Yao,

Y.-L. Chen,

Kun Wu,

J.W. Chen

Publication year - 2005

Publication title -

physical review e

Language(s) - English

Resource type - Journals

eISSN - 1550-2376

pISSN - 1539-3755

DOI - 10.1103/physreve.72.031408

Subject(s) - materials science , magnetic field , van der waals force , particle size , wavelength , nanoparticle , magnetic nanoparticles , condensed matter physics , coprecipitation , dipole , transmittance , magnetic dipole , particle (ecology) , magnetite , optics , nanotechnology , optoelectronics , physics , chemistry , oceanography , quantum mechanics , molecule , geology , inorganic chemistry , metallurgy

Magnetite nanoparticles with diameters of 7, 9, and 12 nm have been prepared by a chemical coprecipitation method. The transmission of light through magnetic fluid containing these nanoparticles has been investigated as a function of film thickness with wavelength between 400 and 750 nm, and applied magnetic fields up to 275 Oe. The transmission threshold shifts to the lower wavelength side with decreasing magnetic fluid film thickness as well as the particle size. For a given film thickness, the transmittance increases with increasing magnetic field for films with a particle size of 7 and 9 nm, but decreases in the 12-nm film. This is attributed to the competition between the van der Waals and dipole-dipole interaction.

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